package com.tom;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.jsp.jstl.core.Config;

/**
 * Servlet Filter implementation class CharacterEncodingFilter
 */
public class CharacterEncodingFilter implements Filter {
		String characterEncoding;
		boolean enabled;
    /**
     * Default constructor. 
     */
    public CharacterEncodingFilter() {
        // TODO Auto-generated constructor stub
    }

    /**
     * @see Filter#init(FilterConfig)
     */
    public void init(FilterConfig fConfig) throws ServletException {
    		characterEncoding = fConfig.getInitParameter("characterEncoding");
    		enabled = "true".equalsIgnoreCase(fConfig.getInitParameter("enabled").trim());
    }

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
			if(enabled || characterEncoding != null){
				request.setCharacterEncoding(characterEncoding);
				response.setCharacterEncoding(characterEncoding);
			}
		
		chain.doFilter(request, response);
	}


	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}
}
